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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '209ab433d1cfdb96d7ed575cbce7478d70083bf49a157369db223204ca17e9b1' 
  AND token = 'qAFYer8X1ShBrPtZFO4ih6ZtxHc1FKwEPIWVVkbMDFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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