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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8b4f593036193d50ae0b138fb8c83878c1e096be6b1bea468d0317157fac3f35' 
  AND token = 'RH1lo597H6+TEOLcaCa7zUjK9PM8/Rbuy4Z62K5iRLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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