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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '711a81af833f7f73ba08a74d4b0ba4075715622aa8153175f171956699e29ce3' 
  AND token = 'ib+/piWDPPGExnuUcfQX3wTQqdW7Y2T5R8EK3u5ns2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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