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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bbbbd6d5766f9d2311acd024f539c0d654d100bea6699eb5308c70a4d1d49184' 
  AND token = 'eO+Vby2VCoKFoRmj3D0AN/zE9Dhlid7px26QtdHP/t4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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