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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c0cc0e877bc3efaf8bbe6e88d95724abd35ce5a65ea77232b7491c1ecb362f22' 
  AND token = 'jEOG2vUUdVoRtQXi5AcAld/kpmfQ6fxb7SJXbXFtrIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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