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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '23ff6391ed20dfceab0c94e8601bbc0e0984642b7583c5f84e9f251be0cdfa22' 
  AND token = 'k82yrX/tEmBHW9XyBhPh/J1mICRTtx1MO5Qr4yTjFCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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