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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b19fda8a7a135eb60ed356479014d0eb408f444433d996aeb7c877c3b2957bb4' 
  AND token = 'vBUexE8v7ik4M0tQcQUf5BbL0Sm2nl3UhDhzuu7mAJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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