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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9258ce0ee8b451ce60ccb1a6c520b6c8c823c023f069ec493cb81d6b4c156a59' 
  AND token = '71Mi9kRSsVbPua6KNxV1mu/gOinExa27IyoHFJJJiS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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