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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd4dbcbabceecb6eee00e74b8993db507b216b0821c19f1eb1f2193b0ba18c5fc' 
  AND token = 'qfSzjfHRCEhjvdNOE89ExtNyKwehJPV42Zy2lr2AC1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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