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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '92d09b7d7d73c46764d4b8f853d14d50f9194d11ee92103ceacd5752ebfa8083' 
  AND token = 'HdR80kH6gREAt7FHGi+I2GUtD/DdFqxwa9YbQuq9EjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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