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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eda88c071e02fcb54b2760d97dc6eb77bec12ded6adc3c331c98bdd12c758fa5' 
  AND token = '8FdZCKf7tjhYm+/uTzUIa4bpcB8tM56XRXyg3fAAeY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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