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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c3e983587daeae9751a9afff8e42ecc0aebd3e791ad10626b5c04d2c53334c7b' 
  AND token = 'OrPLTYVxfYvhhcMWHSrH+KqlK8F9tK1yhJL0H+P3xHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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