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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2fd55f99014d4e486dc8d61d692d3bd30924e7e17f57ac147f70030184ebf0b8' 
  AND token = 'rJ1RXQTPhR0sPY4Tue5v6yrR2HQBLP3DnTi96y2x94I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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