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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '321240fc5c177ee73f84d0cc01df26c372f39dda6f19426495456cc2dd18eaa7' 
  AND token = 'dSbRvYJWS6ROer1Xsv7cCb5brJOs9CL9a78jd3bRX2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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