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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0b32a297ca400a03425e9bfe40c1983e9d23c3bc6a31eead2c141eacdd8028f7' 
  AND token = 'Pq2kxoQpYU6w+gvQ+KUNO711GyafG8R3fC94BVes0fs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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