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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7f39c38ad316c0e72f888eeb3894ff98272fee61b9d883c69fc9f512986ef3ac' 
  AND token = '7Pjuecr5r2IDfE7a5Trfq+OT0sv9vw57VfAO9cmPxk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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