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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '72cf26502b81496c4add93d39cd67c483662bf0209f9d0f1314a93badae40e65' 
  AND token = 'nCELHE8bMr8mO0MV683O3pH1wWzRIRvrQnsrLyp/Ks0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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