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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5fa2bfbd2609498c18f5c71d9cdee67b7b917672e5d1d50978b8ff85ba47a801' 
  AND token = 'Fa83XfSUkbj1uGOaZEJ0kc/EkEVkCWuUKzqhINFKUKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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