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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ae9872367ee30c0e14fa61e96da4f07f87ca9df77cedaf2de4932f25dd8cbc11' 
  AND token = 'fOXDQ33rT6GHNI+HsELQTGLOC8/eCsj+o4uE6i2/xGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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