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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '033dec175a8992890dc4ee7ca292b3e3a2fde2d792966129fa48a2568f2dcb84' 
  AND token = 'L+A05dqd25IfZKE1zel+oEsGRLBSMY4LXee7gWzO74A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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