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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c7c0e686fdd15a7d8a0d583d32db315305cf008a4c6ff81068120cac372fe031' 
  AND token = 'vRoeVJyZnd+T4QBw+UaTsYRHe19uFhk7UpMq8aznM+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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