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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2d0b6dae59eaebec2b09fe96ad1da20796d1a646bdf30c4dbe726e08f8e05fca' 
  AND token = 'F/0O/ghEt0qA0ILDr7nRoFVeM8vBeGhD/Df+tp+X0Cs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}