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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3371d1b6359fc6c48f1202d329f97f9e858046afde53c1eb2e475de13f35d1f1' 
  AND token = 'Ep+6GRZ6ztY+H3095k5G85zOI2ocy+YmrwCZWZXHAbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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