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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1a7fc7a8dbc4116643b5ed3eac1ce2b7ec3b122881d6e241c29b7bd01b13c0b6' 
  AND token = 'h7mlTm8SzKF5BZlv4exqX/wgS7Xg0Afxk3fNwJIAtUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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