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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ae7c216daccee88b89a247f8600aee53702a398a68129bd131d551ad25883115' 
  AND token = 'p9WBfOx6GfRWc6Auo2tx7GgPzmwuOG+384Yw80msJeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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