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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '910a025df384dd5872a7d431d1c8faf82125b6e7fe6f7fb9d55adb15712b51ff' 
  AND token = 'dbjfrUDWe0D57RbOW09QAr7QlSPMEFPPtsphy5BOevU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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