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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1c4da190e95735f621eb39784fb57133b239660e7c471060883a0fc56b90700f' 
  AND token = 'wIBmjfrJ9F456KdCspSUhgS5Kkr9aYOcbQb8k9oZo0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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