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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd868ca470dc691581f873f50e02b4a15114b72dddaba0e6dfb5a21595ad96aa1' 
  AND token = '28vNCclaf7mGW0bhgDvUD5v91GF/Rd5sgWXHAUBDAM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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