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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '85c7ec881bbc1786a56abfd60e543cc04661fca2c935624fffa398067723abd0' 
  AND token = 'iXb4zX2IwvO340Q9Q0x4hFLzXuEpZlUJwYO6QypP1X4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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