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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a4386752b3609bf53cd3975387712800e770055a976969a78c6796fb5c0b3595' 
  AND token = '9oCdIV8QL/8SD6MgWA0aQp1poLzeAstSj4Z8Q2J3DIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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