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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9775d23bb8ca4fc04432bb2be37b8eb3cb4ce50fea8879043488f6537d2fd617' 
  AND token = 'k16p88QKuwvrr7UOt1GFeoO59S/LJPIAxB6mkeGZWn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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