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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '85b9d926e54a285014977e15312a7a092e1b5445ff553c5acb15cfd9f5bb7a5c' 
  AND token = 'bbi3I6TE9kV43fEix8Bpp8/mfkYw+XpobEiWGJmgsGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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