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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1dbe9eb645b7b0d72c921d9ed98ab60ae32395dafbcec985f5d1a660517ad2e0' 
  AND token = 'JgFZ4FoGvl5onDAsJ5hcdhswG2hfEtRz5U4P+K01ePA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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