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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a8869c7b0a7980446a4e52869647756acafbbedfabc573b84451a71b7da0571d' 
  AND token = 'wFLc2MDMlOdaLSWlpE7XllM6THNQ0T9g+dD/4hKkkjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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