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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '49313ffbfa6e3cb9c7ab6db0893f38cbae765badb7a8380fff9394fda917934f' 
  AND token = '7NSsD6isgFynxarjfp9y1QJb4sav4f5m71J67uPDZ/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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