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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0dc59fae3faac0e9d6600d9899e8a8dc7301046815200cf46f30c68727112052' 
  AND token = 'Eh4zgJiSmdNsd02Y9KpjE+ONKM+TAzc3AS3Dck1aUN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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