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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '74a3a6582a5464fbc494f8bf4995f4cdfdae0f1bce61ce50bf1716e6ecb72e14' 
  AND token = 'BAymdoMZJCVcLpqpyNza3ULNaXjadbLqw9RSYs1q0to=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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