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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '785d2970f735b28773e0d8ddd2edfa68d88f02940893bbf7fb341fdf17900762' 
  AND token = 'DbXYo2db1oha2Syt8dHiNr4LSN75gLb4IU9g7ETLRy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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