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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6dfbb41d9ad608c0fcb3c09e3571a33626a2e529077487556090993dc70738b0' 
  AND token = '9Ck8pYRiiRBPbnYXLYVZU4SKa4WvAHQM2bqboETEgaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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