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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5e1660d7f855136d7874b2643f4a947f949206e338306a28f3a87e11f5b08253' 
  AND token = 'RIvgb89EW+MvQ0Jt1obi0hcsHGnHkF1919N4CYarB5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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