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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bcf055c395a5a58eadba1a0565f084940d882bb43c5c4271eb29e2fa8246161d' 
  AND token = 'Gmu07yTdD/ZEoKGmTcudybZ7PQAo0gnQRHQbsyYwZcw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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