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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '338a985d2dad619b437cb3592bbd16ce7324b7ccd39ee31df9605f9ad82e63c0' 
  AND token = 'U4Z7OX90ML92ex+LZa90Hr4dX4Zr1XzZWFRN94xxVfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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