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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2fa27049fc36efb76e1e21004c36bb42971b301736bc64293766735545196a52' 
  AND token = 'kgwuXQOs2excB9ne6mz/GOXfia+PbG2gnedkPcmTLxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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