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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9211cc7ceb28095f567a146dc9c2e6a8c1965aa04c9d7bd5854f0cff5dc04632' 
  AND token = 'Rp36rfyk5+q5SR9PHzTeU39RHBaptUw76YFTAGBN18Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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