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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '71dae76a506fc956ea3f6d7c5faaac93e7eae5171463aa01f19d8abd84db418e' 
  AND token = 'IiHRhdCiuLLvVrKP1awX7qzKUblMkVQ5PKvyHKJTDDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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