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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a587aec9bec16a38051e0a20d8c592316ddb38b2be0b76c2351011d6a5322472' 
  AND token = '0uUIEewW/JhvlOijomUMGrUWbJLPyt746dIc/bNmDHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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