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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '62fb128a6ad27de75f9cce4c4cde352c88f4a53defd90f41510ff399e4d3fa4d' 
  AND token = 'K/F0my2xFCcWhvlxMkq7llq8EXRtgzfogCQj8My/a9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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