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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8808263caed310307f36968eaf95da6b0246097a812266894bf4933241938486' 
  AND token = 'MylLaCWylG4KG7GZ1J9LbvTVwy0vl3Wwl/p2DB6Oywo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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