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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e496d01fa78ef2ad5fe2eb572e2132ea77a4719b13ef455c34a008f0edf0df16' 
  AND token = 'qvN8npa3DjAxK+clTAD34fm+gdmCpWpVENXm7SB6rXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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