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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd5e9e4f57d55ca0d61faf86a0e7651fdcf4721115ef81ac555e1edea47a23038' 
  AND token = 'kBNPIF5punQ4V91OQNRqT8oreqxIwZLVZI5dgy3uer8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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