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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ccdbe768f424d67297b2eb3eaf1ea9d8fb676fad040a8e15e65a2f0105f41f13' 
  AND token = '9YJSoj7trMrVXN9lPL837zd0Dilv9ke7gRdAqVabADk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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