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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'df936c5beb8cae90bfeb18cdf19dd17dbe48fce27f6856edf69268643f82ef8f' 
  AND token = '1ARVSy8B0CrK5m51U/mohi/oP6W5a1MGV0usemGK4dg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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