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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '70bf69942077d2fddfae7521dc168f4e82f9a9300c7a9f2abca4213c8238d4fd' 
  AND token = '6b2vN9nvxjzOa0YERZysSzTbHcg9yKeqcyd4xTPcaog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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