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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fed6ba2f821622309e71b9324445906e460cdd57014e846a6de14a124494b65d' 
  AND token = '5Za9Tce7k5Ba76zmKXSb7yKQhVTGj8KxlRdMC5wOLOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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